Download or read book Dissolved Organic Carbon DOC and Trihalomethane THM Production of Cultivated Peat Soil from the Sacramento San Joaquin Delta California written by Alex Tat-Shing Chow and published by . This book was released on 2000 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dissolved Organic Carbon DOC Production from Cultivated Organic Soils on Twitchell Island Sacramento San Joaquin Delta California written by Kenneth K. Tanji and published by . This book was released on 1999 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book dissolved organic carbon concentrations and compositions and trihalomethane formation potentials in waters from agricultural peat soils sacramento san joaquin delta california implications for drinking water quality written by and published by DIANE Publishing. This book was released on with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dissolved Organic Carbon Concentrations and Compositions and Trihalomethane Formation Potentials in Waters from Agricultural Peat Soils Sacramento San Joaquin Delta California written by Roger Fujii and published by . This book was released on 1998 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Water Resources Center Report written by and published by . This book was released on 1994 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Annual Report written by California Water Resources Center and published by . This book was released on 1998 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Report Water Resources Center University of California written by and published by . This book was released on 2000 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dissertation Abstracts International written by and published by . This book was released on 2001 with total page 832 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Water Resources Center Report written by and published by . This book was released on 1994 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings of the Annual Meeting of the Pacific Division American Association for the Advancement of Science written by American Association for the Advancement of Science. Pacific Division and published by . This book was released on 1999 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book American Doctoral Dissertations written by and published by . This book was released on 2000 with total page 816 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Annual Meetings Abstracts written by American Society of Agronomy and published by . This book was released on 1999 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Annual Report written by California Water Resources Center and published by . This book was released on 1998 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Controls on Dissolved Organic Carbon Composition and Export from Rice dominated Systems written by Monika Krupa and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Rice covers 161 million hectares of the Earth's surface and is estimated to use one-fourth to one-third of the World's developed freshwater resources. Outflow water from rice fields can contain high concentrations of dissolved organic carbon (DOC), which is a key precursor in the formation of carcinogenic and mutagenic trihalomethanes (THMs). This study examined rice area, outflow, drainwater reuse, soil properties, and time, and related them to the concentration of DOC and the composition of dissolved organic matter (DOM) exported from eleven rice-dominated watersheds located in the Sacramento Valley, California during the growing season (May to September 2008). Water samples were collected from subwatershed inflow and outflow every one to two weeks and analyzed for DOC concentration, trihalomethane formation potential (THMFP), and also specific ultraviolet absorbance (SUVA254) and the spectral slope parameter (S), which are indicators of DOM composition. DOC concentrations ranged from 1.56 to 14.43 mg L−1 (mean = 4.35 mg L−1). DOC and THM fluxes decreased over time, but increased with outflow. The SUVA254 and S parameters indicated that the fraction of aromatic DOM moieties increased with time, outflow, and drainwater reuse. Additionally, the export of the highest DOC concentrations and THMFP occurred at the onsets of rice field flooding and draining. Lastly, subwatersheds with outflow less than approximately 4,700 m3ha−1 behaved as sinks of DOC. These results suggest that the management of outflow and drainwater reuse are the most feasible tools for controlling DOC export and DOM composition. They further indicate that very specific rice irrigation events pose the greatest potential impact on downstream water quality. The response of DOC export and DOM composition to outflow, drainwater reuse, and discrete rice irrigation events, with their corresponding impacts on DOM degradation, mobilization, and sorption processes occurring in flooded fields over time, highlights that the management of water in rice growing areas has the potential to significantly impact carbon biogeochemical dynamics in aquatic ecosystems.

Download or read book Dissolved Oxygen Dynamics Sacramento San Joaquin Delta and Suisun Bay written by California. Dept. of Fish and Game and published by . This book was released on 1972 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Discriminating Between West side Sources of Nutrients and Organic Carbon Contributing to Algal Grow and Oxygen Demand in the San Joaquin River written by William T. Stringfellow and published by . This book was released on 2002 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fate of Natural Organic Matter and Formation of Disinfection By products in a Conventional Water Treatment Plant written by Noha Hesham Abdel Halim and published by . This book was released on 2014 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Elevated levels of disinfection by-products (DBPs), detected in Cairo residential water supply during the past decade, were the motivation to study the process of DBP formation at the water treatment plant (WTP) stage. It is hoped that an in-depth understanding of natural organic matter (NOM) characteristics and DBP formation/removal in an existing WTP will yield a baseline as well as insights for the development of optimum strategies for cost-effective reduction of potentially harmful drinking water compounds such as Trihalomethanes (THMs) and Haloacetic acid (HAAs). The objectives of this research were to: investigate the degree of removal of the various NOM fractions in conventional WTPs and identify the factors that may possibly enhance their removal; and investigate the levels of formed DBPs within conventional WTPs when pre-chlorination and post-chlorination are applied. Water samples were collected from El-Fustat WTP in Cairo from 4 different points along the treatment process and covering the four different seasons of a year. NOM was quantified by classical surrogate parameters such as total organic carbon (TOC), dissolved organic carbon (DOC), and ultraviolet absorbance (UVA254); and characterized more precisely according to its hydrophobic-hydrophilic properties using resin fractionation. THMs, HAAs and other water quality analyses were conducted for all collected samples. Measurements of NOM fractions following each treatment unit indicate that the hydrophobic fraction is significantly removed by the coagulation/flocculation/ sedimentation processes (56% to 13% in the various seasons) whereas the transphilic, and hydrophilic fractions were removed to much lower degree (51% to 10%) and (15% to 4%), respectively. The hydrophobic fraction had formed flocs with the added alum more than the other two fractions. No further removal of NOM takes place in rapid sand filtration or post-chlorination units. Although the THMs values recorded for the entire study were complying with the Egyptian guidelines, it is not guaranteed that tap concentrations will comply to the guidelines limits. This is because THM/THMFP does not exceed 39%, leaving room for 61% to be reacted in pipe lines and storage tanks until it reaches the customers taps. In addition, HAAs concentrations at the plant effluent were much higher than the regulating limits, alarming the WTP to exert more effort to reduce THMs, and HAAs values. On an attempt to identify the relative importance of NOM fractions in THMs formation, the measured values of the THMs were regressed to each NOM fraction and the coefficient of determination (R2) was calculated. Results showed that unlike hydrophobic fraction and transphilic fractions (R2 = 0.01, 0.14), respectively, hydrophilic NOM fractions are consistently most responsible for THM and HAAs production at the plant effluent (R2 = 0.77, 0.62. Although, hydrophilic fraction was the main contributor to THMs and HAAs formation in El-Fustat WTP; coagulation/flocculation and sedimentation could not successfully remove it during treatment. Accordingly, the processes of coagulation/flocculation/sedimentation/filtration are not guaranteed to be useful in decreasing the DBPs levels. El-Fustat WTP does not technically implement "Enhanced Coagulation"; however, initial results from this study shows that the hydrophillic DOC fraction is less likely to be removed during Enhanced Coagulation but the major DOC contributor to DBPs formation. Future work should test this hypothesis through a bigger and wider sample size. Free chlorine concentrations are responsible for the high THM levels at the plant effluent, which implies its responsibility on THMs formed in the plant and the formation potential in distribution pipelines. Therefore, reducing the chlorine doses as much as possible to reach zero free chlorine before post-chlorination and the minimum acceptable free chlorine residual for secondary disinfection is going to reduce the THMs and HAAs levels substantially.